Laser technology as one of the most important manufacturing tools in industry has entered the solar cell production processes in almost all aspects.Laser processing is extensively applied in the complete production li...Laser technology as one of the most important manufacturing tools in industry has entered the solar cell production processes in almost all aspects.Laser processing is extensively applied in the complete production line of major parts of high efficiency solar cells based on silicon wafer today,including laser edge isolation,grooving,drilling,soldering,etc.The thin-film solar cells which are on the threshold between development and mass production exhibit further potential in the reduction of production costs and also provide many opportunities for laser processing like laser scribing,laser edge deletion,etc.展开更多
Presently,interfacial solar water evaporation(ISWE)is now injecting new vitality into the field of water remediation.However,during the ISWE process,the nonvolatile pollutants might be concentrated in residual water,a...Presently,interfacial solar water evaporation(ISWE)is now injecting new vitality into the field of water remediation.However,during the ISWE process,the nonvolatile pollutants might be concentrated in residual water,and further contaminate the environment.Preparing advanced photothermal materials is in need to get comprehensive purification of various pollutants in residual water.Herein,we report a facile laser thermal method to prepare Cu_(2−x)S/sulfur/reduced graphene oxide(Cu_(2−x)S/S/rGO)nanocomposites for realizing all-round residual water remediation during the ISWE process.The as-prepared Cu2−xS/S/rGO nanocomposites demonstrated excellent photothermal and photocatalytic properties.Through blending with GO nanosheets having excellent adsorption capacity,the synergetic effect of photothermal,photocatalytic,and adsorption properties resulted in highly efficient purification of rhodamine B,bacterial,and heavy metal ions in residual water during the ISWE process.The experimental results also showed that,increasing solar light intensity can promote the residual water remediation,but ultrafast water evaporation under high light intensity may deteriorate the purifying effect.This report may pave a new way to prepare multifunctional materials for water remediation through the ISWE technology.展开更多
The importance triiodide （CH3NH3PbI3 or of methylammonium lead MAPbI3） organic-inorganic hybrid perovskites has shot up dramatically since their use in highly efficient thin-film perovskite solar cells （PSCs）. How...The importance triiodide （CH3NH3PbI3 or of methylammonium lead MAPbI3） organic-inorganic hybrid perovskites has shot up dramatically since their use in highly efficient thin-film perovskite solar cells （PSCs）. However, the basic structural characterization of these fascinating materials remains sparse. In particular, Raman spectroscopy, which is a powerful vibrational spectroscopy characterization tool and complements other characterization methods, of MAPbI3 under ambient conditions is plagued with difficulties. Here, a systematic ambient Raman spectroscopy characterization study of MAPbI3 thin films is conducted under different conditions （excitation laser wavelength, integration time, filter characteristic）. The results from this study help elucidate the possible sources of artifacts in the Raman spectra, and raise the awareness of the challenges in the ambient Raman spectroscopy of MAPbI3 perovskites. Approaches to overcome these challenges are suggested.展开更多
We review several recent theoretical and experimental results in the study of exciton condensates. This includes the present experimental advances in the study of exciton condensates both using layers and coupled bila...We review several recent theoretical and experimental results in the study of exciton condensates. This includes the present experimental advances in the study of exciton condensates both using layers and coupled bilayers. We will shortly illustrate the different phases of exciton condensates. We focus especially on the Bardeen-Cooper-Schrieffer-like phase and illustrate the similarities to superconductors. Afterwards, we want to illustrate several recent advances and proposals for measuring the different phases of superconductors. In the remainder of this short review, we will provide an outlook for the possibilities and complications for future technical applications of exciton condensates.展开更多
Light trapping photonic crystal(PhC)patterns on the surface of Si solar cells provides a novel opportunity to approach the theoretical efficiency limit of 32.3%,for light-to-electrical power conversion with a single j...Light trapping photonic crystal(PhC)patterns on the surface of Si solar cells provides a novel opportunity to approach the theoretical efficiency limit of 32.3%,for light-to-electrical power conversion with a single junction cell.This is beyond the efficiency limit implied by the Lambertian limit of ray trapping~29%.The interference and slow light effects are harnessed for collecting light even at the long wavelengths near the Si band-gap.We compare two different methods for surface patterning,that can be extended to large area surface patterning:1)laser direct write and 2)step-&-repeat 5×reduction projection lithography.Large area throughput limitations of these methods are compared with the established elec-tron beam lithography(EBL)route,which is conventionally utilised but much slower than the presented methods.Spec-tral characterisation of the PhC light trapping is compared for samples fabricated by different methods.Reflectance of Si etched via laser patterned mask was~7%at visible wavelengths and was comparable with Si patterned via EBL made mask.The later pattern showed a stronger absorbance than the Lambertian limit6.展开更多
文摘Laser technology as one of the most important manufacturing tools in industry has entered the solar cell production processes in almost all aspects.Laser processing is extensively applied in the complete production line of major parts of high efficiency solar cells based on silicon wafer today,including laser edge isolation,grooving,drilling,soldering,etc.The thin-film solar cells which are on the threshold between development and mass production exhibit further potential in the reduction of production costs and also provide many opportunities for laser processing like laser scribing,laser edge deletion,etc.
基金supported by the key research and development program of Shanxi Province(International Cooperation)(No.201903D421082)Natural Science Foundation of Shanxi Province(No.20210302123029)+1 种基金the National Natural Science Foundation of China(Nos.51602292 and 22105181)Scientific and Technological Innovation Programs of Higher Education in Shanxi(Nos.2019L0589 and 2020L0279).
文摘Presently,interfacial solar water evaporation(ISWE)is now injecting new vitality into the field of water remediation.However,during the ISWE process,the nonvolatile pollutants might be concentrated in residual water,and further contaminate the environment.Preparing advanced photothermal materials is in need to get comprehensive purification of various pollutants in residual water.Herein,we report a facile laser thermal method to prepare Cu_(2−x)S/sulfur/reduced graphene oxide(Cu_(2−x)S/S/rGO)nanocomposites for realizing all-round residual water remediation during the ISWE process.The as-prepared Cu2−xS/S/rGO nanocomposites demonstrated excellent photothermal and photocatalytic properties.Through blending with GO nanosheets having excellent adsorption capacity,the synergetic effect of photothermal,photocatalytic,and adsorption properties resulted in highly efficient purification of rhodamine B,bacterial,and heavy metal ions in residual water during the ISWE process.The experimental results also showed that,increasing solar light intensity can promote the residual water remediation,but ultrafast water evaporation under high light intensity may deteriorate the purifying effect.This report may pave a new way to prepare multifunctional materials for water remediation through the ISWE technology.
文摘The importance triiodide （CH3NH3PbI3 or of methylammonium lead MAPbI3） organic-inorganic hybrid perovskites has shot up dramatically since their use in highly efficient thin-film perovskite solar cells （PSCs）. However, the basic structural characterization of these fascinating materials remains sparse. In particular, Raman spectroscopy, which is a powerful vibrational spectroscopy characterization tool and complements other characterization methods, of MAPbI3 under ambient conditions is plagued with difficulties. Here, a systematic ambient Raman spectroscopy characterization study of MAPbI3 thin films is conducted under different conditions （excitation laser wavelength, integration time, filter characteristic）. The results from this study help elucidate the possible sources of artifacts in the Raman spectra, and raise the awareness of the challenges in the ambient Raman spectroscopy of MAPbI3 perovskites. Approaches to overcome these challenges are suggested.
文摘We review several recent theoretical and experimental results in the study of exciton condensates. This includes the present experimental advances in the study of exciton condensates both using layers and coupled bilayers. We will shortly illustrate the different phases of exciton condensates. We focus especially on the Bardeen-Cooper-Schrieffer-like phase and illustrate the similarities to superconductors. Afterwards, we want to illustrate several recent advances and proposals for measuring the different phases of superconductors. In the remainder of this short review, we will provide an outlook for the possibilities and complications for future technical applications of exciton condensates.
基金project support by Nano-Processing Facility (NPF), AIST, Tsukuba, Japan where we were granted access to photo-lithography stepperARC DP190103284 "Photonic crystals: the key to breaking the silicon-solar cell efficiency barrier" project+1 种基金the visiting professor program at the Institute of Advanced Sciences at Yokohama National University (2018-20)Nanotechnology Ambassador fellowship at MCN (2012-19)
文摘Light trapping photonic crystal(PhC)patterns on the surface of Si solar cells provides a novel opportunity to approach the theoretical efficiency limit of 32.3%,for light-to-electrical power conversion with a single junction cell.This is beyond the efficiency limit implied by the Lambertian limit of ray trapping~29%.The interference and slow light effects are harnessed for collecting light even at the long wavelengths near the Si band-gap.We compare two different methods for surface patterning,that can be extended to large area surface patterning:1)laser direct write and 2)step-&-repeat 5×reduction projection lithography.Large area throughput limitations of these methods are compared with the established elec-tron beam lithography(EBL)route,which is conventionally utilised but much slower than the presented methods.Spec-tral characterisation of the PhC light trapping is compared for samples fabricated by different methods.Reflectance of Si etched via laser patterned mask was~7%at visible wavelengths and was comparable with Si patterned via EBL made mask.The later pattern showed a stronger absorbance than the Lambertian limit6.
